CVE-2026-34939 — PraisonAI: ReDoS via Unvalidated User-Controlled Regex in MCPToolIndex.search_tools()

CVE-2026-34939

PraisonAI: ReDoS via Unvalidated User-Controlled Regex in MCPToolIndex.search_tools() PUBLISHED

Description (CNA)

PraisonAI is a multi-agent teams system. Prior to version 4.5.90, MCPToolIndex.search_tools() compiles a caller-supplied string directly as a Python regular expression with no validation, sanitization, or timeout. A crafted regex causes catastrophic backtracking in the re engine, blocking the Python thread for hundreds of seconds and causing a complete service outage. This issue has been patched in version 4.5.90.

Affected (CNA)

Vendor / product	Versions
MervinPraison / PraisonAI	affected < 4.5.90

CWE

CWE-1333

References

https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-8w9j-hc3g-3g7f

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.